FAIR VALUE MEASUREMENTS (Financial Liabilities at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock
Liabilities, Fair Value Disclosure [Abstract]
Performance-based equity awards	$ 3,789	$ 5,364
Cash-Settled Award | Restricted Stock Units (RSUs)
Liabilities, Fair Value Disclosure [Abstract]
Cash-settled restricted stock units	2,111
Level 1 | Restricted Stock
Liabilities, Fair Value Disclosure [Abstract]
Performance-based equity awards	3,789	0
Level 1 | Cash-Settled Award | Restricted Stock Units (RSUs)
Liabilities, Fair Value Disclosure [Abstract]
Cash-settled restricted stock units	2,111
Level 2 | Restricted Stock
Liabilities, Fair Value Disclosure [Abstract]
Performance-based equity awards	0	0
Level 2 | Cash-Settled Award | Restricted Stock Units (RSUs)
Liabilities, Fair Value Disclosure [Abstract]
Cash-settled restricted stock units	0
Level 3 | Restricted Stock
Liabilities, Fair Value Disclosure [Abstract]
Performance-based equity awards	0	5,364
Level 3 | Cash-Settled Award | Restricted Stock Units (RSUs)
Liabilities, Fair Value Disclosure [Abstract]
Cash-settled restricted stock units	0
Recurring
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities measured at fair value on a recurring basis	5,900	5,364
Recurring | Level 1
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities measured at fair value on a recurring basis	5,900	0
Recurring | Level 2
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities measured at fair value on a recurring basis	0	0
Recurring | Level 3
Liabilities, Fair Value Disclosure [Abstract]
Total liabilities measured at fair value on a recurring basis	$ 0	$ 5,364